Police received reports that a man was hit with a crowbar outside a Blackpool cafe.
Police were called to Munchy's Cafe, on Coronation Street, at around 12.30pm yesterday.
A man in his 50s had seen two men with a crowbar behaving in a way he believed was suspicious. He challenged them and was hit with the crowbar. A North West Ambulance Service spokesman said his injuries were not believed to be serious.
Police said the victim is believed to have used a walking stick to cause some damage to the men's van.
A spokesman said: "We received an allegation of an assault on Coronation Street and it is under investigation."